Astromat

This is a measurement of the capacitance vs. T, C(T), of OREX-800123-0 which transforms by calculation into linear thermal expansion coefficient, alpha(T). The sample is a slab of material, cut from a Bennu stone with parallel sides 3.578 mm thick. See sample pictures for further details. From this measurement the coefficient of linear thermal expansion, alpha, is calculated as a function of temperature. The coefficient of linear thermal expansion, alpha, is represented as DL = alpha * L0 * DT or alpha = DL * L0^(-1) * DT^(-1). Helium pressure in the cryostat was ~ 1 Torr (133 Pa) to thermalize the sample as temperature is decreased at a rate of 0.25 K minute^(-1).